Tag：Give an example
-
Typescript built in type list
Typescript built in type list Above At present, basic TS development projects can be said to be the general trend. Students who have used TS development projects basically say they will never go back. Today, let’s learn about the official built-in types of typescript, so as to improve your development efficiency Partial /** * Make […]
-
The differences among IASs, pass and sass cloud services
We can understand cloud computing as a building, which can be divided into three parts: the top floor, the middle floor and the low floor. Then we can understand IASs (Infrastructure), pass (platform) and sass (software) as three parts of the building. The infrastructure is at the bottom, the platform is in the middle and […]
-
How does Oracle SQL join on express?
We often use join related statements for association queries. What happens to the results of on combined with and and where after the join connection method? When using join on, pay attention to the difference between and where and how to use it join on andThe join on and method is similar to on condition […]
-
[advanced mongodb query] aggregation pipeline (IV) — accumulators
review Review of relevant articles Advanced query of mongodb — review of aggregation pipeline (I)Advanced query of mongodb — review of aggregation pipeline (II)Advanced query of mongodb — review of aggregation pipeline (III) Classification of pipeline operators Pipe operators can be divided into three categories: Stage operators Expression operators Accumulators Refer to the official website […]
-
Learn a Linux command every day (79): parted
Command introduction The parted command is used to create, view, delete and modify disk partitions. It is a disk partition and partition sizing tool. This command is a supplement to the fdisk command, because if the disk size is greater than 2TB, the fdisk command cannot be used for partition operation. Syntax format parted [options] [device [command [options…]…]] Option […]
-
C + +: explicit keyword
Implicit type conversion (implicit call to constructor)give an example: #include <iostream> using namespace std; class Point { public: int x, y; Point(int x) : x(x) {} }; void displayPoint(const Point& p) { cout << “(” << p.x << “)” << endl; } int main() { displayPoint(1); Point p = 1; } Explicit keyword Specifies that […]
-
How are Oracle SQL join on expressed?
We often use join related statements for association queries. What happens to the results of on combined with and and where after the join connection method? When using join on, pay attention to the difference between and where and how to use it join on andThe join on and method is similar to on condition […]
-
Build a microservice development environment under Ubuntu
About this article Writing goal: as a quick reference guide for installing JDK, mysql, zookeeper, redis, mongodb, rabbitmq and other development components under Linux Linux version: Linux Mint 18.2 Sonya (based on Ubuntu 16.04 xenial) Actual combat record JAVA OpenJDK 1 sudo apt install openjdk-8-jdk MySQL 23 install wget https://dev.mysql.com/get/mysql-apt-config_0.8.6-1_all.deb dpkg -i mysql-apt-config_0.8.6-1_all.deb apt update […]
-
Recommend another easy-to-use helper in laravel
Another auxiliary function in laraveloptional()Allows you to access properties or methods of a given object. If the given object isnull, the property or method will returnnullReplace returnerror。 Let’s take an example. // app/Models/User.php class User extends Model { //… public function account() { //… } //… } //User1 exists and so does the account object […]
-
Django encountered could not import settings’ conf.local ‘when configuring settings
I won’t say the originalExamples: Django best practices and deployment: nginx + gunicorn + Supervisor (Ubuntu and CentOS) http://sfdye.com/articles/django-best-practice-and-deployment-with-nginx-gunicorn-and-supervisor/ As a result, an error appears when runserver — settings =… Appears. Could not import settings’ conf.local ‘(is it on sys. Path? Is there an import error in the settings file?): n o module named conf.local […]
-
Add a template for Django 1.7 admin background (use Django suit)
There seems to be a problem with using inline in Django Grappelli. Change the skin: Django suit is the second admin skin recommended by 2scoops Supports: Django 1.4-1.7. Python: 2.6-3.The environment of this article is Django 1.7.1 Django suit official websiteInstallation guide linkSet strategy The translation is as follows: install pip install django-suit # settings.py […]
-
Deploying vs + QT + opencv + Darknet (Yolo) integrated environment under win10
Vs + QT integrated environment Download vs and QT and install. VS：Official website link Qt：Download link Add the bin directory of QT to the path Example of bin directory: D: \ development \ QT \ 5.12.0 \ msvc2017_ 64\bin Download the QT extension of the corresponding version of VS, which can be downloaded in the […]